Harsh Environment Multi Gas Monitor

  • Real-time, simultaneous detection of up to 5 ranges:
    Combustibles 100%VOL / 100%LEL, O2, H2S & CO
  • Large display with auto back lighting
  • Strong sample drawing capability (0.75L/min)
  • Loud 95dB alarm buzzer
  • 3 bright LED alarm windows
  • Intrinsically Safe ATEX Exia II CT4 & MED approved
  • IP67 water and dust resistant
  • Lithium-ion rechargeable battery
  • Compact, light weight, ergonomic design
  • Optional waist strap for hands free operation
  • Data logging as standard


The Riken Keiki model GX-8000 sets a new industry standard for rugged, reliable, portable gas detection.

This robust, lightweight, sample drawing multi-gas monitor is designed to provide continuous and simultaneous exposure monitoring in hazardous areas of flammable, oxygen(O2) and toxic gases (carbon monoxide (CO) and hydrogen sulphide (H2S) ) in air.

The 0-100% volume Thermal Conductive sensor additionally allows monitoring of volume levels of combustibles in oxygen-depleted environments and inert gas atmospheres.

This combination of sensor makes for a versatile detector, suitable for dual-use applications such as Confined Space and Purging or Inerting. Also, it’s rugged IP-67 waterproof design makes it well suited to harsh, tough environments; suitable for industries including oil and gas, utilities, waste water treatment, telecommunications, and marine shipping.

The compact, lightweight design makes it comfortable to carry using the shoulder/neck strap, and the optional waist strap allows for hands free use. The instrument is easy to operate single-handed and the powerful 750ml / minute built-in pump will draw a sample from 30m within a few seconds; alerting the user to a potentially hazardous combustible or toxic gas situation without delay.
The GX-8000 consolidates several of the older classic Riken models, such as the GX-111, NP-237H, GX-7, GX-85N, OX-62B, OX-1, OX-415, OX-226, GP-226, into one versatile unified multigas monitor.

Riken’s Gx-8000 usabliity and reliability are the culmination of 75 years expertise and experience as a leading gas detector and sensor manufacturer. Designed and certified to international standards (ATEX / IECEx / MED (wheel mark), etc), the GX-8000 will help protect workers and property from demanding gas detection applications.


  • Confined Space Monitoring
  • Refineries
  • Petrochemical Plants
  • Chemical Plants
  • Marine Shipping
  • Crude Oil Tankers
  • Gas Carrier
  • Coal and Bulk Carriers
  • Chemical Tanker
  • Coating Field
  • Water
  • Wastewater Treatment
  • Fire Services
  • Telecommunication Services
  • Power Plant
  • Fuel Cell Facilities
  • Utilities
  • Gas Plant
  • Gas Supplier Services


Target gas Combustibles
(CH4, i-C4H1O, H2, others)
Hydrogen Sulfide
Carbon Monoxide
Detection principle Thermal Conductivity Catalytic Combustion Galvanic cell Electro-chemical Electro-chemical
Detection range
0-100 vol%
0-100 LEL%
Gas alarm N/A 1st : 10%LEL
2nd: 50%LEL
1st : 19.5%
2nd: 23.5%
1st : 10.0ppm
2nd: 30.0ppm
TWA: 10.0ppm
STEL: 15.0ppm
1st : 25ppm
2nd: 50ppm
TWA: 25ppm
STEL: 200ppm
Types of alarm Gas alarm : Latching, 2 alarms
Failure alarm: Flow failure, Sensor failure, Battery failure, Circuit failure, Calibration failure
Display of alarm LED: -Flashing LED’s
Buzzer:: -Buzzer sounds alternates between a low and high pitch
Visual display: -Indication value flashes. Alarm message displays and flashes.
Alarm sound More than 95dB (A) at 30cm
Display Digital LCD with auto backlight
Digital display (7 segments) and digital bar graph (25 segments)
(50 segments with single gas versions GX-8000 Type LEL & Type O2)
Sampling method Sample Draw, Minimum 0.75L/min
Power source Lithium-ion battery as standard (fully charged in 3 hours)
Optional 3pcs AA alkaline battery pack also available
(Alkaline battery pack standard with single gas versions:
GX-8000 Type O2 / GX-8000 Type LEL
-Lithium-ion battery optional)
Continuous operation Lithium-ion battery: more than 12 hours (GX-8000 Type O2, more than 20 hours)
AA alkaline battery pack: more than 6 hours (GX-8000 Type O2, more than 12 hours)
Operating temp & humidity -20~+50°C, -4-+122°F below 95%&RH (Non-condensing)
Dimensions & Weight Approx. 154(W) x 81(H) x 127(D) mm, Approx. 1.1kg with Lithium ion battery (Alkaline battery 0.9kg)
Approx. 6.1″(W) x 3.1″(H) x 4.9″(D), Approx. 2.4lb with Lithium ion battery (Alkaline battery 2.0lb)
Ingress proof rating IP67
Explosion proof Intrinsically safe Exia II CT4
Approvals IECEx, ATEX, MED (Wheel Mark), CE, TIIS, HK
Additional features Activity indicator (pilot indicator and pump driving indicator), Pump stop function, Bump test function,
IrDA communication, Data logger, Password protection
(GX-8000 single gas versions Type LEL & Type O2
with confidence beep and LED flash (once every minute)